ENNI® Cores

Base Material Characteristics

Base Material: Nickel Iron material
Ribbon Thickness: 60-300 µm
Ribbon Density: 8.250 - 8.745 g/cm3
Curie Temperature: 400 - 410 °C
Continuous Service Temperature: 150 °C

Code

Material

Band Thickness(mm)

Permeability µ4

Permeability µmax

Saturation Induction (T)

Enni 80

72-83% Ni

0.05-0.2

60 000-240 000

150 000-350 000

0.6-0.8

Enni 55

54-68% Ni

0.05- 0.2

40 000-80 000

100 000-160 000

1.2-1.5

Enni 50

45-50% Ni

0.1-0.2

10 000-12 000

90 000

1.5-1.6

Enni 40

35-40% Ni

0.2- 0.3

4000-9000

50 000-75 000

1.3-1.5


Electro magnetic properties on toroidal cores

Features:

  • High permeability
  • Low magnetization in higher inductions
  • High saturation flux density >0.6T-1.5T
  • Robust design
  • Completed with varnished form, impregnated form and also with plastic case
  • Cased are UL94V-0 compliant
  • Comprehensive range of sizes

Benefits:

  • High efficiency
  • Low temperature rise
  • Smaller component size
  • Higher power throughput
  • High temperature operation

Aplications:

  • Current Transformers
  • Power Transformers
  • Pulse Transformers
  • Current Sensors
  • Earth Leakage Circuit Breakers
  • Measuring Industry


Toroidal Cores

Mechanic and Electromagnetic Guaranteed Values:

Dimensions and Mechanical Tolerances

Electromagnetic Guaranteed Values

 

Cut Cores

- -

Mechanic and Electromagnetic Guarantied Values:

If not agreed for a specific magnetic value with customers C-Cores have the following Magnetic values (measuring frequency 50 Hz. - cut surface quality C)


 Material

Tape
thickness
(mm)

Magnetizing force
 Heff (A/cm)

Measured B (T) for LFe (cm)

Color marking

<=20

<=40

<=80

>80

Nickel - Iron Alloys (50%Ni) ENNI® 50

0.20

0.02
0.25

0.0235
0.47

0.029
0.64

0.032
0.78

0.034
0.88

Green Yellow

Nickel - Iron
Alloys
( 70....80% Ni )
ENNI® 80
Saturation
Induct.? 0.75T

0.20

0.005
0.05
1

0.009
0.11
0.52

0.0125
0.16
0.58

0.015
0.21
0.60

0.0175
0.25
0.61

 Red



Outside diameter

d1 mm

Tolerance

Inside diameter
d2 mm

Tolerance

Height Tolerance

Core Winding Wide Tolerance

Core Winding Wide = C

<= 75

± 2.0

<= 50

± 2.0

+0.8

 

± 0.4

c= 0.5 * ( d1-d2)

<= 150

± 2.0

<=100

± 2.0

+1.5

 

± 0.6

 

 

<= 250

± 3.0

<= 200

± 2.0

+1.5

 

± 1.0

 

 

<= 350

± 3.0

<= 300

± 3.0

+2.0

 

± 1.0

 

 

<= 500

± 4.0

<= 450

± 4.0

+2.0

 

± 1.5

 

 

> 500

± 4.0

<= 450

± 4.0

+3.5

 

± 2.0

 

 

Some advice on using of Split Tape Cores

  1. Split Tape Cores are specially packaged in pares so that damage to the cut surfaces are prevented.
  2. Mechanical and electro-magnetic quality control sheets are provided.
  3. Core halves are marked with paint in order to ensure the halves are of one pair. Halves from different pairs should not be assembled as a pair.
  4. Before the assembly cut surfaces should be thoroughly cleaned.
  5. In order to decrease the magnetic sound, halves of small types can be stuck together with adhesive, bigger types need to be banded. After assembly it should be ensured that no-load - losses are normal, if not the air gap should be decreased.

Type of assembling and dimensions


Rectangular, Oval Shape & Special Type Cores

-


Toroidal Cores in Different Forms
Special Toroidal Cores for Instrument Transformers and special transformers are produced according to customer specifications. Some of these are as follows:
  1. Cross-Section Cores
  2. Oval Cores
  3. Conic Cores
  4. Rectangular Cores

Measurement tolerances and required magnetic characteristics of these special cores should be given by the customer. The insulation of these special cores is also performed according to customer specifications.


C-Cores

-

Size Calculations C-Cores

Standard Electrical Guarantees
If not agreed for a specific magnetic value with customers C-Cores have the following magnetic values (measuring frequency 50 Hz. - cut surface quality C)

 Material

Tape
thickness
(mm)

Magnetizing force Heff (A/cm)

Measured B (T) for LFe (cm)

Color marking

    

<=20

    

<=40

    

<=80

    

>80

    

 Nickel - Iron  Alloys (50%Ni)  ENNI® 50

         

0.20

    

0.02 
0.25

    

0.0235 
0.47

    

0.029 
0.64

    

0.032 
0.78

  

0.034 
0.88

         

Green Yellow

    

 Nickel - Iron
 Alloys ( 70-80%  Ni)
 ENNI® 80
 Saturation Induct.? 
 0.75T

    

0.20

    

0.005
0.05
1

    

0.009
0.11
0.52

    

0.0125
0.16
0.58

    

0.015
0.21
0.60

    

0.0175
0.25
0.61

        

  Red